Let's look at another subtraction. It's not possible to subtract ... Rename 3 as 13 and then subtract: 13 - 7 = 6 If you can subtract two 3-digit numbers from each other, then you can use the ...

Subtraction to 20 Discover how to subtract within 20. Adding three one-digit numbers together Learn how to add three one-digit numbers. Add two-digit numbers Learn how to add two-digit numbers.